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I want to run a program from within my Ruby script, but I want to capture the program’s STDOUT and STDERR separately, without intermingling them, thus doing 2>&1 on the command shell won’t do it for me.
I’d really prefer not to have to direct these to a tempfile and read the tempfile back in to my script. Is there a way I can directly get both of these in my Ruby script?
You should use the Open3 class. It provides methods to execute shell commands that can return stdin, stdout, and stderr as separate IO objects.
http://ruby-doc.org/stdlib-1.9.3/libdoc/open3/rdoc/Open3.html#method-c-popen3